機器
activity
boom
bucket
build
building
bulldozer
concrete
construction
contractors
demolition
dig
digger
digging
dirt
earth
engineering
equipment
excavate
excavating
excavation
excavator
ground
heavy
industrial
industry
loader
machinery
mine
mining
mover
power
quarry
sand
scoop
shovel
site
sky
soil
tractor
vehicle
work
working
works
yellow